Parts of a Circle & Circumference Textbook page 516 IAN page 120.

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Parts of a Circle & Circumference Textbook page 516 IAN page 120

Circumference Diameter The circumference of a circle is the distance around the outside of a circle The diameter of the circle is the distance from one side to the other passing through the centre of the circle What is circumference? What is diameter?

Radius Chord A chord is a line touching the circumference of the circle at two points The radius is the line connecting the centre of the circle and the circumference What is a chord? What is a radius?

Example 1: Name the circle, diameter, and three radii. C AB O The circle is circle O AB is the diameter OA, OB, and OC are radii

Example 2: Find each missing value to the nearest hundredth. Use 3.14 for pi. (A) d = 8 ft; C = ? C = πd C ≈ C ≈ ft 8 ft

Example 2: Find each missing value to the nearest hundredth. Use 3.14 for pi. (B) r = 3 cm; C = ? C = 2πr C ≈ C ≈ cm 3 cm

Example 2: Find each missing value to the nearest hundredth. Use 3.14 for pi. (C) C = in; d = ? C = πd ≈ d ≈ 3.14 d in ≈ d